water in the celler

Hi hope someone out there can help me. i have a 200 year old cottage with a celler and a well just outside. The problem is when it rains it gets into the celler although it never rises more that say four inches (approx). The council said the well was a surface drain and could be filled in with concrete which we have done but there is still water coming in. The floor is already concreted with a membrane underneath and tiled on top. Is the best thing to raise the floor level?